As sustainability expectations in AV and production move from ambition to accountability, Lee Otterway explores why evidence and measurement are becoming essential to real progress. With regulatory and procurement pressures increasing across the UK and Europe, the focus is shifting toward traceable, auditable data that reflects what systems are actually consuming in real operating conditions. In this Production360 Q&A, Lee discusses why system level measurement matters not only for reporting, but for supporting day to day operational and design decisions, noting that “sustainability is becoming less about aspiration and far more about evidence.”